2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * snap_node.c: snap packet processing
18 * Copyright (c) 2010 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vlib/vlib.h>
41 #include <vnet/pg/pg.h>
42 #include <vnet/llc/llc.h>
43 #include <vnet/snap/snap.h>
49 SNAP_INPUT_NEXT_ETHERNET_TYPE,
59 format_snap_input_trace (u8 * s, va_list * va)
61 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
62 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
63 snap_input_trace_t *t = va_arg (*va, snap_input_trace_t *);
65 s = format (s, "%U", format_snap_header, t->packet_data);
71 snap_input (vlib_main_t * vm,
72 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
74 snap_main_t *sm = &snap_main;
75 u32 n_left_from, next_index, *from, *to_next;
77 from = vlib_frame_vector_args (from_frame);
78 n_left_from = from_frame->n_vectors;
80 if (node->flags & VLIB_NODE_FLAG_TRACE)
81 vlib_trace_frame_buffers_only (vm, node,
85 sizeof (snap_input_trace_t));
87 next_index = node->cached_next_index;
89 while (n_left_from > 0)
93 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
95 while (n_left_from >= 4 && n_left_to_next >= 2)
98 vlib_buffer_t *b0, *b1;
99 snap_header_t *h0, *h1;
100 snap_protocol_info_t *pi0, *pi1;
101 u8 next0, next1, is_ethernet0, is_ethernet1, len0, len1,
105 /* Prefetch next iteration. */
107 vlib_buffer_t *b2, *b3;
109 b2 = vlib_get_buffer (vm, from[2]);
110 b3 = vlib_get_buffer (vm, from[3]);
112 vlib_prefetch_buffer_header (b2, LOAD);
113 vlib_prefetch_buffer_header (b3, LOAD);
115 CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
116 CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
128 b0 = vlib_get_buffer (vm, bi0);
129 b1 = vlib_get_buffer (vm, bi1);
131 h0 = (void *) (b0->data + b0->current_data);
132 h1 = (void *) (b1->data + b1->current_data);
134 oui0 = snap_header_get_oui (h0);
135 oui1 = snap_header_get_oui (h1);
137 is_ethernet0 = oui0 == IEEE_OUI_ethernet;
138 is_ethernet1 = oui1 == IEEE_OUI_ethernet;
140 len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0);
141 len1 = sizeof (h1[0]) - (is_ethernet1 ? sizeof (h1->protocol) : 0);
143 b0->current_data += len0;
144 b1->current_data += len1;
146 b0->current_length -= len0;
147 b1->current_length -= len1;
149 pi0 = snap_get_protocol_info (sm, h0);
150 pi1 = snap_get_protocol_info (sm, h1);
152 next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
153 next1 = pi1 ? pi1->next_index : SNAP_INPUT_NEXT_DROP;
155 next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
156 next1 = is_ethernet1 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next1;
158 /* In case of error. */
159 b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
160 b1->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
162 enqueue_code = (next0 != next_index) + 2 * (next1 != next_index);
164 if (PREDICT_FALSE (enqueue_code != 0))
166 switch (enqueue_code)
173 vlib_set_next_frame_buffer (vm, node, next0, bi0);
180 vlib_set_next_frame_buffer (vm, node, next1, bi1);
187 vlib_set_next_frame_buffer (vm, node, next0, bi0);
188 vlib_set_next_frame_buffer (vm, node, next1, bi1);
191 vlib_put_next_frame (vm, node, next_index,
194 vlib_get_next_frame (vm, node, next_index, to_next,
201 while (n_left_from > 0 && n_left_to_next > 0)
206 snap_protocol_info_t *pi0;
207 u8 next0, is_ethernet0, len0;
217 b0 = vlib_get_buffer (vm, bi0);
219 h0 = (void *) (b0->data + b0->current_data);
221 oui0 = snap_header_get_oui (h0);
223 is_ethernet0 = oui0 == IEEE_OUI_ethernet;
225 len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0);
227 b0->current_data += len0;
229 b0->current_length -= len0;
231 pi0 = snap_get_protocol_info (sm, h0);
233 next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
235 next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
237 /* In case of error. */
238 b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
240 /* Sent packet to wrong next? */
241 if (PREDICT_FALSE (next0 != next_index))
243 /* Return old frame; remove incorrectly enqueued packet. */
244 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
246 /* Send to correct next. */
248 vlib_get_next_frame (vm, node, next_index,
249 to_next, n_left_to_next);
257 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
260 return from_frame->n_vectors;
263 static char *snap_error_strings[] = {
270 VLIB_REGISTER_NODE (snap_input_node) = {
271 .function = snap_input,
272 .name = "snap-input",
273 /* Takes a vector of packets. */
274 .vector_size = sizeof (u32),
276 .n_errors = SNAP_N_ERROR,
277 .error_strings = snap_error_strings,
279 .n_next_nodes = SNAP_INPUT_N_NEXT,
281 [SNAP_INPUT_NEXT_DROP] = "error-drop",
282 [SNAP_INPUT_NEXT_PUNT] = "error-punt",
283 [SNAP_INPUT_NEXT_ETHERNET_TYPE] = "ethernet-input-type",
286 .format_buffer = format_snap_header_with_length,
287 .format_trace = format_snap_input_trace,
288 .unformat_buffer = unformat_snap_header,
292 static clib_error_t *
293 snap_input_init (vlib_main_t * vm)
296 clib_error_t *error = vlib_call_init_function (vm, snap_init);
298 clib_error_report (error);
301 snap_setup_node (vm, snap_input_node.index);
303 llc_register_input_protocol (vm, LLC_PROTOCOL_snap, snap_input_node.index);
308 VLIB_INIT_FUNCTION (snap_input_init);
311 snap_register_input_protocol (vlib_main_t * vm,
313 u32 ieee_oui, u16 protocol, u32 node_index)
315 snap_main_t *sm = &snap_main;
316 snap_protocol_info_t *pi;
318 snap_oui_and_protocol_t key;
321 clib_error_t *error = vlib_call_init_function (vm, snap_input_init);
323 clib_error_report (error);
326 h.protocol = clib_host_to_net_u16 (protocol);
327 h.oui[0] = (ieee_oui >> 16) & 0xff;
328 h.oui[1] = (ieee_oui >> 8) & 0xff;
329 h.oui[2] = (ieee_oui >> 0) & 0xff;
330 pi = snap_get_protocol_info (sm, &h);
334 vec_add2 (sm->protocols, pi, 1);
336 pi->name = format (0, "%s", name);
337 pi->node_index = node_index;
338 pi->next_index = vlib_node_add_next (vm, snap_input_node.index, node_index);
341 key.protocol = clib_host_to_net_u16 (protocol);
343 mhash_set (&sm->protocol_hash, &key, pi - sm->protocols, /* old_value */ 0);
344 hash_set_mem (sm->protocol_info_by_name, name, pi - sm->protocols);
348 * fd.io coding-style-patch-verification: ON
351 * eval: (c-set-style "gnu")